PHYL 141 Lecture Notes - Lecture 5: Arrector Pili Muscle, Stratum Corneum, Adipocyte

• School: UH, UH Manoa, UHM
• Department: Physiology
• Course: PHYL 141
• Professor: Rachel Lindsey

Document Summary

Integumentary system consists of skin, hair, oil & sweat glands, nails & sensory receptors. Integumentary system maintains body homeostasis by providing protective physical barrier to the environment & by regulating body temperature (via skin vessels/sweat) Skin consists of 2 portions/layers: (1) epidermis superficial thinner, avascular portion. Epidermis composed of keratinized stratified squamous epithelium contains 4 types of cells: (1) keratinocytes building blocks of fibrous keratin protein; epidermal cells arranged in 4-5 layers; produce keratin. The epidermis layers of skin (from deep to superficial/inside to outside) **from deep to superficial: mnemonic before signing, get legal counsel to remember** Skin graft transfer of patch of healthy skin taken from donor site to cover a wound: new skin cannot generate if injury destroys large area of stratum basale. Include predominantly fibroblasts, some macrophages, few adipocytes (near subcutaneous layer) Increase sa of epidermis increase grip of hand/foot by increasing friction. Pigments that color skin: (1) melanin (2) hemoglobin (3) carotene.